Ernst Haeckel

Ernst Heinrich Haeckel (1834-1919), German biologist and philosopher who popularized Charles Darwin's work in Germany. He was a professor of comparative anatomy. He noticed that "ontogeny recapitulates phylogeny", which is not entirely true. Haeckel was one of the first to consider psychology as a branch of physiology. He also proposed the term "ecology". His observations on the link between ontogeny and philogeny? have been named as the "recapitulation law". As Haeckel's effort to prove the law was provably misguided and inaccurate, he became a favorite target of creationists, as a "proof" against evolution.

See http://www.ucmp.berkeley.edu/history/haeckel.html for a biography.